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is a significant concern for physicians. Central. B8 [( C5 C4 V/ R
precocious puberty (CPP), which is mediated, ~7 n$ B s* P2 P7 Q8 l
through the hypothalamic pituitary gonadal axis, has
1 m3 B& R# ^! E3 |0 P) Oa higher incidence of organic central nervous system
# J! @: ]+ O4 W: S6 blesions in boys.1,2 Virilization in boys, as manifested
5 ?* _% t! Q. } T: U; i; q% E0 Gby enlargement of the penis, development of pubic
0 P8 X1 d: J# h0 Jhair, and facial acne without enlargement of testi-+ t& `% c& e) I0 U
cles, suggests peripheral or pseudopuberty.1-3 We. H/ u c+ x1 J2 c+ o7 j" x
report a 16-month-old boy who presented with the, C9 m4 C, y; {5 X7 S2 O e
enlargement of the phallus and pubic hair develop-$ l7 v3 Q, {# f) R
ment without testicular enlargement, which was due
. a: ~! c6 @0 O r# y+ k8 Ito the unintentional exposure to androgen gel used by# q6 }5 _% d5 c4 E7 e% R% {
the father. The family initially concealed this infor-
- h2 Y7 U0 T! `. Jmation, resulting in an extensive work-up for this
+ j3 Q+ g$ k" {& U" Z; xchild. Given the widespread and easy availability of2 x# L- r3 X1 K* J+ f; F5 {
testosterone gel and cream, we believe this is proba-2 M9 W) ~- l. A1 J! ?4 x( K4 u
bly more common than the rare case report in the/ O1 A& Q! q+ F9 a- N$ C) M; p6 z
literature.40 h! w' s [) E% j7 N+ t G0 {
Patient Report% I8 T0 _' V% C' u
A 16-month-old white child was referred to the2 Z# e$ _2 w, S* i/ Y ~
endocrine clinic by his pediatrician with the concern
, c& W+ m$ g3 Y7 {- B/ ]of early sexual development. His mother noticed
6 Z, m- l# T: N1 ], B6 ? glight colored pubic hair development when he was: L8 B; u3 _3 p# i
From the 1Division of Pediatric Endocrinology, 2University of
% |* E" R) p; W9 C% k+ ^South Alabama Medical Center, Mobile, Alabama.
" \; b5 }3 R% W' i% b! dAddress correspondence to: Samar K. Bhowmick, MD, FACE," n. e4 w4 A7 ~8 \ H
Professor of Pediatrics, University of South Alabama, College of
! {! b4 p3 O" x: VMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
5 Q, W1 E4 x# g( w4 Y( ee-mail: [email protected].
1 H8 b1 k5 @4 t0 o3 [+ P# J5 S. gabout 6 to 7 months old, which progressively became
) a; M1 g/ @. sdarker. She was also concerned about the enlarge-
3 V" u0 X8 C+ O$ R% h& {2 I* ]& c8 lment of his penis and frequent erections. The child
0 E1 l" m7 H& p3 I4 F$ N; D3 S: ywas the product of a full-term normal delivery, with
3 {# @) N: ?- F \) Q% U+ Va birth weight of 7 lb 14 oz, and birth length of6 e7 e; h/ [# g( E$ s
20 inches. He was breast-fed throughout the first year
& h+ Y- m' ?/ N; yof life and was still receiving breast milk along with
6 j- S/ K2 u$ Y: dsolid food. He had no hospitalizations or surgery,
* @0 x1 H) u( P$ x: ^and his psychosocial and psychomotor development7 G% W- x7 Z) z& t/ l m/ H5 n
was age appropriate.5 G! R$ p6 P8 K3 ~& d0 g8 w
The family history was remarkable for the father,
+ g1 e* n: |# r" D) C, Q0 xwho was diagnosed with hypothyroidism at age 16,
+ N. o" G: q* i' s: T% {which was treated with thyroxine. The father’s
" Z2 D, [ P! K. U/ ?6 iheight was 6 feet, and he went through a somewhat
H0 k0 m _9 a p learly puberty and had stopped growing by age 14.
9 K0 i2 }2 p, pThe father denied taking any other medication. The. M( H* V: t, ^6 U* u& {' {
child’s mother was in good health. Her menarche$ B1 X X/ N, L C
was at 11 years of age, and her height was at 5 feet
9 _0 t7 [2 P5 Q7 B' t5 \5 inches. There was no other family history of pre-
& U: |, B2 z1 l+ z( U7 Y& }4 `" G9 a$ @cocious sexual development in the first-degree rela-0 i) K) m @, U, U3 R
tives. There were no siblings.
5 g' {9 l, s: G; z6 ?Physical Examination
1 f- t( U- ^/ S4 w* JThe physical examination revealed a very active,6 T) @3 ^( ?, q2 L7 H! I3 Y* L' ?- n" R5 d
playful, and healthy boy. The vital signs documented: P' V1 p1 ~$ R. N1 j
a blood pressure of 85/50 mm Hg, his length was! M$ \8 d! G3 a/ V8 ]# }
90 cm (>97th percentile), and his weight was 14.4 kg
4 T" n5 P. d9 v5 i' R/ I4 K+ ~(also >97th percentile). The observed yearly growth
$ |8 T( M5 ~$ o" [( rvelocity was 30 cm (12 inches). The examination of
% o, X& }. F @3 {4 \0 othe neck revealed no thyroid enlargement.
: p/ z. p' m) m- w; i0 y# H8 RThe genitourinary examination was remarkable for
: J/ \1 q4 v7 F7 l! ?' Tenlargement of the penis, with a stretched length of' [( E. l' P+ ?. l
8 cm and a width of 2 cm. The glans penis was very well
% ]8 B! v& {; N; [developed. The pubic hair was Tanner II, mostly around7 U1 }& y; e, l! c
5407 @- K1 d2 |0 q. H2 W7 M
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from7 J8 w' ~5 y) r( W
the base of the phallus and was dark and curled. The
! M P O. o: {! Ltesticular volume was prepubertal at 2 mL each.
: C/ \6 x0 L% R8 Q' G1 dThe skin was moist and smooth and somewhat
: f7 U" R6 m$ @" ioily. No axillary hair was noted. There were no* i& m: a9 q6 [2 B2 \
abnormal skin pigmentations or café-au-lait spots.
# x5 \! z5 h2 C% H. [. kNeurologic evaluation showed deep tendon reflex 2+
& f' ]; D8 T2 Wbilateral and symmetrical. There was no suggestion! c1 k1 F/ O! e& c4 ^% z
of papilledema.
" i" Y5 z) H- u' u! W. g" ALaboratory Evaluation
7 A3 f7 ?1 C9 b2 iThe bone age was consistent with 28 months by
; J" s1 R; N1 W8 X5 _using the standard of Greulich and Pyle at a chrono-; `; {! l% S7 [4 y% u, X9 Z
logic age of 16 months (advanced).5 Chromosomal5 Y0 C! L2 L5 u& O. } ^& F
karyotype was 46XY. The thyroid function test
! D4 ?0 | E; @showed a free T4 of 1.69 ng/dL, and thyroid stimu-
0 ]. A4 p1 Z7 c. G9 `lating hormone level was 1.3 µIU/mL (both normal).7 q3 K$ Q% L; G3 y6 v
The concentrations of serum electrolytes, blood
8 u% X$ T8 A" k! p& i, n$ t5 e, durea nitrogen, creatinine, and calcium all were+ _- {" r( N# Y7 o$ E/ t
within normal range for his age. The concentration
* ]9 n O. g% h7 E( N8 xof serum 17-hydroxyprogesterone was 16 ng/dL& k/ x2 e/ i3 \: S$ D: Q0 P, K! S
(normal, 3 to 90 ng/dL), androstenedione was 20
) I& @! a: N# n) q1 _ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-4 \( q% p# O* j/ \& l
terone was 38 ng/dL (normal, 50 to 760 ng/dL),, x- k* l. j% L; P* _
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
# f( u8 R6 [% J( b49ng/dL), 11-desoxycortisol (specific compound S) u2 I- A0 E1 [" k1 z# l, R
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
% `4 `. R! [/ vtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
: U. i* ^5 E$ s5 I& A: e) Otestosterone was 60 ng/dL (normal <3 to 10 ng/dL),
- u% w8 ~3 T* A" z6 N. Rand β-human chorionic gonadotropin was less than% [8 S5 y) i9 L! T& r' W3 b
5 mIU/mL (normal <5 mIU/mL). Serum follicular% o) G" s( X' N+ t7 R- w' [
stimulating hormone and leuteinizing hormone
! I. `2 i. a/ j2 pconcentrations were less than 0.05 mIU/mL
8 e, j* \4 f! _1 [(prepubertal).) v& K6 [; Y- o% c* U
The parents were notified about the laboratory
. s7 O0 ]; v7 _# }& b* hresults and were informed that all of the tests were
, i5 k$ L& W7 b0 cnormal except the testosterone level was high. The
9 g) @. [4 E( Dfollow-up visit was arranged within a few weeks to
# V9 x0 |% g9 S. R9 Xobtain testicular and abdominal sonograms; how-
# B5 H7 ]8 F5 c$ ?. n. v$ y2 qever, the family did not return for 4 months.
" p9 H1 R' ]4 F9 \! LPhysical examination at this time revealed that the, [& B5 w! ?& k6 z" A
child had grown 2.5 cm in 4 months and had gained
/ H" w& E7 O# ?8 Z- M2 kg of weight. Physical examination remained% L# E# i6 a; }& @2 T/ \
unchanged. Surprisingly, the pubic hair almost com-
0 e, p" k, Z/ Rpletely disappeared except for a few vellous hairs at& t) Q, z) ?) H5 r! P3 S& l
the base of the phallus. Testicular volume was still 2' e2 m, ` I/ E7 {( ], w' l! @
mL, and the size of the penis remained unchanged.) x* R2 @$ r) N
The mother also said that the boy was no longer hav-) b4 a% Q, u: a: }
ing frequent erections.
/ U& C9 P/ e c% G" Q9 d# jBoth parents were again questioned about use of
5 u% \& L% H2 K$ H) r5 _2 Iany ointment/creams that they may have applied to
4 }+ J- E- Y/ u, q; z ]) bthe child’s skin. This time the father admitted the
8 b$ l/ {" p3 y4 u3 x3 TTopical Testosterone Exposure / Bhowmick et al 541( y3 Q: h9 W7 ^1 N/ [- k) X- L
use of testosterone gel twice daily that he was apply-
" @. W7 y# ?. S' n; ]; }ing over his own shoulders, chest, and back area for
" B6 @" A6 ?& {/ N2 B h: C! D% F, |a year. The father also revealed he was embarrassed
1 _5 s1 |% t& v$ C' q Y5 ]to disclose that he was using a testosterone gel pre-
4 |9 o: _1 ]0 lscribed by his family physician for decreased libido; _0 F' F$ f( N+ R
secondary to depression.$ N0 H0 J5 N$ T
The child slept in the same bed with parents.! E- J g4 Q, S1 [! T
The father would hug the baby and hold him on his
8 y) M! I# u9 `) nchest for a considerable period of time, causing sig-
8 p+ O, S! X6 z' Enificant bare skin contact between baby and father.& o0 `/ [2 O& P+ }
The father also admitted that after the phone call, ]* r8 `0 V p) T9 t, h
when he learned the testosterone level in the baby
9 P* z1 M% p: E# h4 _was high, he then read the product information
+ ^8 G' \" f# B$ jpacket and concluded that it was most likely the rea-
) g# m+ b# P/ H, |, Xson for the child’s virilization. At that time, they
. M O2 q$ \$ e! Jdecided to put the baby in a separate bed, and the
- H& c5 K$ q3 R1 j2 m- F4 i1 Kfather was not hugging him with bare skin and had1 e9 v+ K, `, d% ]
been using protective clothing. A repeat testosterone
d) ?6 U4 @" B3 l* vtest was ordered, but the family did not go to the
X. p" @( d$ @5 b \laboratory to obtain the test.
- O) o) r8 M# G) v6 ]+ R Y6 ~# \Discussion8 T7 k0 y+ Q+ M: S
Precocious puberty in boys is defined as secondary# U; |4 Q% F9 ^ ^
sexual development before 9 years of age.1,43 z/ T7 ]8 j* i* \ V4 A( t/ N
Precocious puberty is termed as central (true) when
" A' x( m6 q& t% ~( _; @1 `. |4 X( xit is caused by the premature activation of hypo-8 m9 y6 P n* O( z. }3 ~
thalamic pituitary gonadal axis. CPP is more com-
( z# _. S! S, H4 ^' pmon in girls than in boys.1,3 Most boys with CPP
4 Z( ^- A$ X7 {may have a central nervous system lesion that is! h* T: y7 h% A" S
responsible for the early activation of the hypothal-2 j. c4 d1 `/ y- ~$ m) @, s" L
amic pituitary gonadal axis.1-3 Thus, greater empha-. f& E7 }' x. M
sis has been given to neuroradiologic imaging in* I6 g* F. V! ^' u
boys with precocious puberty. In addition to viril-
0 A/ l) c" h( `4 ]ization, the clinical hallmark of CPP is the symmet-: i5 z! u2 Q$ x5 W: h: {# V
rical testicular growth secondary to stimulation by/ b s5 E- n$ O6 c; T4 U% l2 o
gonadotropins.1,3. F1 m* {. v0 ~2 [ d9 z
Gonadotropin-independent peripheral preco-
- W g2 t! Y+ mcious puberty in boys also results from inappropriate/ N0 q# [# {, h9 ~
androgenic stimulation from either endogenous or* p: z# T, a0 y8 B, S4 h
exogenous sources, nonpituitary gonadotropin stim-
- d4 Q; C0 ], l* julation, and rare activating mutations.3 Virilizing
0 j: I( o$ `6 E, ^congenital adrenal hyperplasia producing excessive
$ X# s* g3 j/ N" P' K( B0 K' tadrenal androgens is a common cause of precocious
( l) T" {( j# f4 o: [. [puberty in boys.3,4' A* M+ x, }) Q% L+ e* c5 R6 d/ }. q
The most common form of congenital adrenal& h1 X* I6 T% y# a9 [
hyperplasia is the 21-hydroxylase enzyme deficiency.) U* y% M: `# I' O% |! y$ G4 K' D; B% l
The 11-β hydroxylase deficiency may also result in7 A8 K9 u* @' ~# O& M8 J
excessive adrenal androgen production, and rarely,
0 ^3 m$ Q6 y4 I5 l6 B! M' kan adrenal tumor may also cause adrenal androgen, |; G# s. J! u/ o* Y: G3 j
excess.1,3
$ O. i p/ e& r( D; cat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ {6 v9 ^' E% u: n
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
; v0 K/ c# x0 k% G# V1 yA unique entity of male-limited gonadotropin-$ y+ d# f; M5 }
independent precocious puberty, which is also known
) m( {" o) O6 V7 Y$ a7 Qas testotoxicosis, may cause precocious puberty at a
- B4 I/ [2 o* `3 [; F& O, @4 pvery young age. The physical findings in these boys: C4 Y) [9 k5 P5 B; p t! V* L
with this disorder are full pubertal development,
, Q3 n' d% F- o9 Wincluding bilateral testicular growth, similar to boys$ V* z% n! Z, |5 T5 d& k
with CPP. The gonadotropin levels in this disorder9 K4 k) z1 c5 s/ C! I# t+ t' O
are suppressed to prepubertal levels and do not show
/ B6 Z. O! ^: T% A" e bpubertal response of gonadotropin after gonadotropin-" P0 d: r: G( e. e- ^
releasing hormone stimulation. This is a sex-linked- ?9 @, P! Q' f0 W( q2 @: [/ k+ U
autosomal dominant disorder that affects only- K1 ^' _# o+ i2 M( G
males; therefore, other male members of the family" D, M; a7 A' t
may have similar precocious puberty.35 U5 E) V. |4 {
In our patient, physical examination was incon-
/ [/ p) K" z5 q6 o# csistent with true precocious puberty since his testi-
6 Q- X, a/ U: k( M6 F$ J: lcles were prepubertal in size. However, testotoxicosis
# m0 D7 v4 A+ C/ Uwas in the differential diagnosis because his father
3 P! F# e) S; O( `/ \/ U+ u' d6 pstarted puberty somewhat early, and occasionally,3 |% j; q) c1 O4 S' Q
testicular enlargement is not that evident in the
) @) {; T9 @$ C- o6 {beginning of this process.1 In the absence of a neg-2 |- h' _& T, c1 q
ative initial history of androgen exposure, our
% {, l6 k( D5 vbiggest concern was virilizing adrenal hyperplasia,; P7 a" q9 j/ t( a+ E* P
either 21-hydroxylase deficiency or 11-β hydroxylase
: q* l2 w- u+ X& ?3 g! |3 Jdeficiency. Those diagnoses were excluded by find-) `1 E* C$ P3 q$ a$ a9 z
ing the normal level of adrenal steroids.
1 Q# U* P# Y5 d6 d Q5 K4 W5 _; cThe diagnosis of exogenous androgens was strongly
2 R( i/ X$ @. A) l+ J5 i6 z {suspected in a follow-up visit after 4 months because
/ N9 K( P, {& R, t/ z" Nthe physical examination revealed the complete disap- V% m: M$ F3 E' ^; E2 s
pearance of pubic hair, normal growth velocity, and9 H- x! w8 }8 v) }3 H! j8 |) v4 L
decreased erections. The father admitted using a testos-
! k6 @' V2 W: Kterone gel, which he concealed at first visit. He was
0 U1 l8 A2 _. p7 U* Q5 dusing it rather frequently, twice a day. The Physicians’
1 R$ u8 `( [2 [2 ^3 c, J9 K* k1 h: SDesk Reference, or package insert of this product, gel or: ?( c+ R& {. b/ ^$ t
cream, cautions about dermal testosterone transfer to6 p: d& k* G6 E, _) G
unprotected females through direct skin exposure., m" g q1 G$ B; z& t3 E
Serum testosterone level was found to be 2 times the7 V1 o; K6 {. e
baseline value in those females who were exposed to& K2 X2 K7 J0 g, V& O6 I* B% }
even 15 minutes of direct skin contact with their male' S9 z* b" D& \ I# P% D
partners.6 However, when a shirt covered the applica-
" | j3 N* B, Wtion site, this testosterone transfer was prevented.
" X K5 L3 ^* o2 ^% ]Our patient’s testosterone level was 60 ng/mL,
7 P' E9 q# q$ a! `! Jwhich was clearly high. Some studies suggest that
' K0 Y2 c# q2 X/ Y& G3 j* Idermal conversion of testosterone to dihydrotestos-
. v; {( Q7 z! ~& Z# B9 Sterone, which is a more potent metabolite, is more
8 ^( @+ ?3 R F% h# T Pactive in young children exposed to testosterone
1 O4 k. M0 s ^1 ^; c1 C5 Lexogenously7; however, we did not measure a dihy-
8 P5 M7 [+ g. O: zdrotestosterone level in our patient. In addition to
% ^" P1 W. D) `5 S& Gvirilization, exposure to exogenous testosterone in
6 m2 X, T; @& _/ A- a( ychildren results in an increase in growth velocity and
2 ~, F. c& ~, V; I6 l- @. uadvanced bone age, as seen in our patient.
$ d! a. u* W0 hThe long-term effect of androgen exposure during P! c8 c8 l& T w
early childhood on pubertal development and final
1 x) V ?& Y A# \adult height are not fully known and always remain. j1 [* u( e( y( Y6 ]
a concern. Children treated with short-term testos-" `' g M! r: V- a' e. g
terone injection or topical androgen may exhibit some
' g; D6 X1 R* Dacceleration of the skeletal maturation; however, after
- v) Q9 A6 I. T: S9 a2 Pcessation of treatment, the rate of bone maturation
8 Z. q- }1 p0 ^* m+ Cdecelerates and gradually returns to normal.8,9
d/ I! l ~% S7 g" tThere are conflicting reports and controversy# V: o# m4 W0 ?2 s! A9 m+ r
over the effect of early androgen exposure on adult
" a3 P. \. P& {, K/ Dpenile length.10,11 Some reports suggest subnormal
/ j) c7 l4 e# u5 y; L; T5 Cadult penile length, apparently because of downreg-
: n( W0 V- U4 rulation of androgen receptor number.10,12 However,7 l" J" f1 k! y& d- R- v/ _
Sutherland et al13 did not find a correlation between7 D! Q* _1 p& o, V
childhood testosterone exposure and reduced adult$ I. S1 @ F" s$ u$ K; L
penile length in clinical studies.
# K: s& n+ }& E# p6 E" }3 x. RNonetheless, we do not believe our patient is" m; y4 F+ C2 F, ^
going to experience any of the untoward effects from
$ V q3 R$ W- \- ^% w' D; z0 Ntestosterone exposure as mentioned earlier because
. c/ m8 E9 ?% Q) S4 e6 c, o" [1 ythe exposure was not for a prolonged period of time.4 X( L- [# h+ E: I& N6 L; d
Although the bone age was advanced at the time of3 B5 ]& x' H% M6 ~! N
diagnosis, the child had a normal growth velocity at' C; K5 ^/ O1 @' b. K
the follow-up visit. It is hoped that his final adult
1 C% Q5 l# U9 B0 u( `. Theight will not be affected.( p) }5 Y( T: L8 t5 K1 w$ x* w. r/ |, H
Although rarely reported, the widespread avail-# u V8 `: S# W5 c8 s9 }
ability of androgen products in our society may8 o1 Y( A8 E/ @9 H$ Q
indeed cause more virilization in male or female2 n! n. [6 ~. E2 x5 u+ @3 }2 r d
children than one would realize. Exposure to andro-, H3 z) F$ z( m5 x0 M+ p% j$ H5 Y
gen products must be considered and specific ques-
6 n" R+ u6 B# V# X# F1 Ztioning about the use of a testosterone product or
( o P; S6 i7 i* ]0 V0 I4 s% o: Zgel should be asked of the family members during
4 \4 t9 R, R7 O% c5 D) Fthe evaluation of any children who present with vir-
) Z' x. h5 u& _. z# }$ z0 e0 O9 Kilization or peripheral precocious puberty. The diag-
9 o1 W( R ] K- f: M8 Ynosis can be established by just a few tests and by
% [, U" A+ t. ~7 [appropriate history. The inability to obtain such a
\! a) C; s9 y2 e) ahistory, or failure to ask the specific questions, may
& B, V! m4 M% ~3 ~# [result in extensive, unnecessary, and expensive8 s7 e- K& C# w1 _ p$ K
investigation. The primary care physician should be# V6 |: H% `& b4 C; s8 D
aware of this fact, because most of these children
. d. H, u! V' G8 h" [) f2 L* ]may initially present in their practice. The Physicians’7 a) O6 p: m( L( n6 l) [/ g& ^7 A
Desk Reference and package insert should also put a d9 T6 a$ d( C/ X% l8 ^) Z2 k* G
warning about the virilizing effect on a male or% V! R5 |: W) L5 l2 F( r
female child who might come in contact with some-) {6 {3 Z9 C% j' M' N1 w e- j
one using any of these products.
. ?- r N0 V' T1 `3 ~% f( RReferences% e) j' P$ {) T) c/ z* T
1. Styne DM. The testes: disorder of sexual differentiation& [$ c( @9 ~' o% d9 K9 h. N
and puberty in the male. In: Sperling MA, ed. Pediatric
1 q& v3 o1 h* _ ^0 e* qEndocrinology. 2nd ed. Philadelphia, PA: WB Saunders;" Z" X6 s9 z8 M) ^
2002: 565-628.: K( V6 u9 O6 m; r1 [% z
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious9 t' W8 G7 |* p0 ]& G, p
puberty in children with tumours of the suprasellar pineal
5 ]2 ^& w* U% o3 @5 rat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from& r3 T& E4 g& A3 ]
Topical Testosterone Exposure / Bhowmick et al 543
. K/ Z& w( u% n. }. I) I/ fareas: organic central precocious puberty. Acta Paediatr.* y2 T! f2 y: q0 S4 f$ g6 e4 f
2001;90:751-756.% c2 O. ]0 N5 S. ~$ C* `
3. Lee PA. Puberty and its disorders. In: Lifshitz F, ed./ `" B% L. p) }: G! S
Pediatric Endocrinology. 4th ed. New York, NY: Marcel2 K9 Z# [ |. ?3 I/ {6 i2 [
Dekker Inc; 2003:211-238., @/ J- k8 K; I. q
4. Yu YM, Punyasavatsu N, Elder D, D’Ercole AJ. Sexual" g% E- ]1 L. ]3 \
development in a two-year-old boy induced by topical; l- W+ u0 R2 E5 ]: v5 ]/ W
exposure to testosterone. Pediatrics. 1999;104:e23.
4 B) _9 c+ B% z, J7 `6 p5. Greulich WW, Pyle SI, eds. Radiographic Atlas of$ P, p, p/ X, K- }
Skeletal Development of the Hand and Wrist. 2nd ed.
" a6 H1 G5 p) C) A3 n9 SStanford, CA: Stanford University Press; 1959.
% M$ e8 i$ E8 ~6. Physicians’ Desk Reference. Androgel 1% testosterone,$ h6 `/ i) u' ?# _# S% }
Unimed Pharmaceutical Inc. Montvale, NJ: Medical
" [" f5 j0 g. g- `, d) J0 w7 Q, ~5 _Economics Company, Inc; 2004:3239-3241.0 S5 D7 @/ n# |6 z i% t: @# M* F
7. Klugo RC, Cerny JC. Response of micropenis to topical
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