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is a significant concern for physicians. Central' w! L; s2 f7 L b% }8 a
precocious puberty (CPP), which is mediated
/ T* Z n5 W) A$ Ythrough the hypothalamic pituitary gonadal axis, has6 y! c) U9 y, f% l5 V
a higher incidence of organic central nervous system
: o# k* ^7 V7 Llesions in boys.1,2 Virilization in boys, as manifested
+ ]4 _; }- U; v. R U" @by enlargement of the penis, development of pubic
5 F% i! i. h& b8 v7 Fhair, and facial acne without enlargement of testi-
# H: F' O6 K! acles, suggests peripheral or pseudopuberty.1-3 We4 Y) _- c: p: S" V9 l
report a 16-month-old boy who presented with the
! K! \; L1 o( N5 Eenlargement of the phallus and pubic hair develop-
5 M7 h- r4 y& ] Xment without testicular enlargement, which was due
3 P/ T7 D5 ^6 u# F1 V' I' n) @( ito the unintentional exposure to androgen gel used by6 {7 J! R d/ y* t6 M" J' K
the father. The family initially concealed this infor-, r, M' Y$ M) o& F3 B0 L' K$ a
mation, resulting in an extensive work-up for this5 s3 Q# p- |; b5 N6 F* N/ W
child. Given the widespread and easy availability of
: C! y. L8 \( ^" _ `& ytestosterone gel and cream, we believe this is proba-
0 M+ Q4 ~6 \/ \8 p- q) o! fbly more common than the rare case report in the
3 Z% ?" p5 L, |: W$ yliterature.43 l& {- G+ p) G1 I* k+ H
Patient Report
% Z$ Q& H h" Z2 r) G* \A 16-month-old white child was referred to the: E' X4 B8 P4 t
endocrine clinic by his pediatrician with the concern# f# X4 z8 M& L8 V% {
of early sexual development. His mother noticed2 Z) J6 i% ^. l6 @+ l4 y
light colored pubic hair development when he was
' `4 {$ B) W1 Z0 O( K4 o% y+ ~0 BFrom the 1Division of Pediatric Endocrinology, 2University of$ V# p0 g, o: M: _6 A# u
South Alabama Medical Center, Mobile, Alabama.' c& y' P$ O; ^: U: q
Address correspondence to: Samar K. Bhowmick, MD, FACE,9 T+ w0 R# n4 C; E" _9 R
Professor of Pediatrics, University of South Alabama, College of
+ c* D- p! K2 j% a! O+ pMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
0 r, {1 T/ w$ c/ K' ke-mail: [email protected].
. k& G" P0 x/ }# oabout 6 to 7 months old, which progressively became# q5 P6 g C* b5 q9 c3 M) J
darker. She was also concerned about the enlarge-$ g( R X8 r0 o7 R1 a j$ c
ment of his penis and frequent erections. The child
7 t/ P% o& `8 f8 j) Zwas the product of a full-term normal delivery, with
! j: l' b5 A- {+ t' j& x& ta birth weight of 7 lb 14 oz, and birth length of/ L1 A+ j( V% y6 W5 R
20 inches. He was breast-fed throughout the first year
) q# X% t1 o9 J8 G% I% oof life and was still receiving breast milk along with! r: q1 A& ~9 Y8 G+ j( W
solid food. He had no hospitalizations or surgery,
1 S. @2 p* H, _2 q6 z, |and his psychosocial and psychomotor development
A2 R a; E4 D4 mwas age appropriate.! h/ }% z' L; ?) i( W
The family history was remarkable for the father,3 c- E6 U8 ~2 {4 o# u- E. l
who was diagnosed with hypothyroidism at age 16,
2 m, \" C u- ^& D: k4 r5 x2 cwhich was treated with thyroxine. The father’s
$ j" ~( b( @0 k/ |! kheight was 6 feet, and he went through a somewhat6 s& s" y9 p# }' [3 q1 ]
early puberty and had stopped growing by age 14.5 [0 ]/ ~/ X. h4 N4 R
The father denied taking any other medication. The) C) L E B! Z5 y1 y
child’s mother was in good health. Her menarche- z. P" [& m# ^
was at 11 years of age, and her height was at 5 feet+ Y0 F" S j6 X; C( ^
5 inches. There was no other family history of pre-
+ x" A6 N+ U4 ~8 k" C4 |cocious sexual development in the first-degree rela-& _/ B) c5 {3 f/ V
tives. There were no siblings.
4 b$ Y# \' ?" oPhysical Examination
. C9 ~& S f% L9 a! M/ J9 lThe physical examination revealed a very active,$ d7 B1 i+ `" a1 Z! g- K
playful, and healthy boy. The vital signs documented
, ^9 w* }5 g) ~3 \6 q( s; l% Ma blood pressure of 85/50 mm Hg, his length was+ G7 h4 ?, I6 R7 h
90 cm (>97th percentile), and his weight was 14.4 kg0 r1 E+ S9 P0 U4 s) s
(also >97th percentile). The observed yearly growth4 R: l/ K. E" m1 M5 @/ N
velocity was 30 cm (12 inches). The examination of
6 `1 E! m; u" nthe neck revealed no thyroid enlargement., U+ E; L$ \2 u8 A! |7 l' ~
The genitourinary examination was remarkable for. x$ u( l0 J+ P3 F
enlargement of the penis, with a stretched length of: m8 ~4 a; i7 W- O) ~
8 cm and a width of 2 cm. The glans penis was very well
/ T6 m! e$ [7 p q; ?developed. The pubic hair was Tanner II, mostly around; {3 C2 P# {$ h) r5 F
540
( F* ~* f/ U( J7 R( {# c5 @6 E8 qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
4 t, m$ r7 ~ j% _the base of the phallus and was dark and curled. The
; B) @+ l/ V7 y$ A4 Ptesticular volume was prepubertal at 2 mL each.
* w F7 z8 o; w; JThe skin was moist and smooth and somewhat
" H: C2 }" r/ ]( ooily. No axillary hair was noted. There were no1 ]. N2 A( g- M2 F! p2 n
abnormal skin pigmentations or café-au-lait spots.
0 v+ L& }! M$ q* `) O, BNeurologic evaluation showed deep tendon reflex 2+
- o$ e5 n% u, }- jbilateral and symmetrical. There was no suggestion# s% R9 P( ?/ K- m7 H1 B
of papilledema.5 {6 Q; Z* d9 u" {
Laboratory Evaluation0 R- [# ]8 Q( D6 O5 C9 k4 B" v! P) T
The bone age was consistent with 28 months by
5 p, k. W' [$ R& ]0 Y1 _* yusing the standard of Greulich and Pyle at a chrono-+ W' E( @# T2 f; H6 {' u
logic age of 16 months (advanced).5 Chromosomal+ t! p% t( l, F8 I+ ~
karyotype was 46XY. The thyroid function test- T! F- G2 D# u# X2 g
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
& Z+ X& k e% Zlating hormone level was 1.3 µIU/mL (both normal).
8 Q6 \+ h6 i5 H5 QThe concentrations of serum electrolytes, blood5 ^! a) f! ]5 w& \+ n: _
urea nitrogen, creatinine, and calcium all were) w, s Q2 g! D
within normal range for his age. The concentration) b" u* _* m i. J0 R( m
of serum 17-hydroxyprogesterone was 16 ng/dL8 L! Q9 G# x( U P* R! Q$ C
(normal, 3 to 90 ng/dL), androstenedione was 20
5 o9 z- O1 c. G2 Z _ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
/ ^& \3 g7 Y8 t: w Bterone was 38 ng/dL (normal, 50 to 760 ng/dL),1 ?3 ]3 T/ W# j; J8 B1 v) b4 m
desoxycorticosterone was 4.3 ng/dL (normal, 7 to9 O$ ?, |6 v1 [9 S
49ng/dL), 11-desoxycortisol (specific compound S)
; ]" l0 c' J. P& R- ]9 ?' y1 xwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-: ^( H: k p" P2 P
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
( S6 \ C$ w8 U0 r/ Ptestosterone was 60 ng/dL (normal <3 to 10 ng/dL),' i5 T# ^: p, C- d5 F; F$ r
and β-human chorionic gonadotropin was less than0 e1 {2 i& y ^( v! C$ p! A2 {5 \6 ^
5 mIU/mL (normal <5 mIU/mL). Serum follicular
4 `' k5 u. U6 l1 `9 l& {stimulating hormone and leuteinizing hormone' u1 i/ d+ T7 ^( M0 v3 U0 _, P1 I
concentrations were less than 0.05 mIU/mL$ g& N y/ E6 R$ X3 O. B/ g
(prepubertal).; ^6 v3 D7 u9 Z/ O
The parents were notified about the laboratory! x) E$ c1 k7 x- \
results and were informed that all of the tests were( { u- y9 v% ]6 U0 j& J
normal except the testosterone level was high. The0 A! ? [, v% O; e0 M0 e
follow-up visit was arranged within a few weeks to+ A4 W9 |! c: j& V) G, t& I- y
obtain testicular and abdominal sonograms; how-
8 p6 ?6 a1 D, {! [3 i7 xever, the family did not return for 4 months.
; G* ^4 @4 t7 \4 b( o1 CPhysical examination at this time revealed that the
% p# Z/ b6 x1 V2 ]' G4 ychild had grown 2.5 cm in 4 months and had gained, h; y( B' O6 y% J8 I
2 kg of weight. Physical examination remained# j2 S8 x" B% r, A# C1 L" K7 \
unchanged. Surprisingly, the pubic hair almost com-( Z# `/ x! [/ G, k- i' ?
pletely disappeared except for a few vellous hairs at
! \+ Z. j5 _( M5 s( Fthe base of the phallus. Testicular volume was still 2
+ ^- t: }& P t; j( WmL, and the size of the penis remained unchanged.& U1 H1 u4 W+ ^' ? i
The mother also said that the boy was no longer hav-
f0 e; f: R. N/ aing frequent erections.
5 C7 ^2 n9 ~) }& M! Y4 |, ZBoth parents were again questioned about use of
$ D6 P# i" t( U4 @& k* M5 S- Oany ointment/creams that they may have applied to
5 R1 o$ ~) k2 O5 Q: gthe child’s skin. This time the father admitted the
4 E. _! [* W& b( m. GTopical Testosterone Exposure / Bhowmick et al 541
$ k# w3 @1 Q4 b9 C$ \% Xuse of testosterone gel twice daily that he was apply-
% l6 t. R2 G: p1 x& Ging over his own shoulders, chest, and back area for& m0 N0 [& X* d ]% L
a year. The father also revealed he was embarrassed! Q R/ r9 I, [0 m1 E9 Q. A& ^
to disclose that he was using a testosterone gel pre-) W4 {3 c' w; k" X& |1 h
scribed by his family physician for decreased libido, @! {( _5 L3 W8 r0 h+ o: j
secondary to depression.
4 U9 N6 Z* O9 |9 ~) F9 O" xThe child slept in the same bed with parents.. ^& {: F( ~( R& M% r! ?5 v4 n! b. j
The father would hug the baby and hold him on his6 q4 e4 X5 L! J7 `2 t
chest for a considerable period of time, causing sig-
$ ]% z: p0 n: A3 I, t# Xnificant bare skin contact between baby and father.
; y) L: f4 W6 o. w" T& ^The father also admitted that after the phone call,
+ [. O% s$ E" ^; F7 jwhen he learned the testosterone level in the baby9 @1 t8 k/ F, J, S% v* b7 z
was high, he then read the product information4 q% ?7 s+ c. O F
packet and concluded that it was most likely the rea-1 w- j+ t" d- v4 y! @9 Q# F* x
son for the child’s virilization. At that time, they
$ e, @3 Z$ _4 U ]6 d1 d- Vdecided to put the baby in a separate bed, and the$ N4 t- X% V) |! R. e
father was not hugging him with bare skin and had
8 F- s4 U$ B7 T q) x' Qbeen using protective clothing. A repeat testosterone
' |$ {$ x7 H8 y: ^: v0 @test was ordered, but the family did not go to the
5 J' F4 M' @$ A5 Y( dlaboratory to obtain the test.( U5 `" o+ F/ {( k" b2 ?$ ^0 A
Discussion1 I1 U/ k5 t. T+ s
Precocious puberty in boys is defined as secondary3 {/ L* g% m! m/ H
sexual development before 9 years of age.1,4( o1 M0 S- V F! R
Precocious puberty is termed as central (true) when7 R# u) [1 V! p( [% k
it is caused by the premature activation of hypo-7 `/ Y5 t* t( C8 O9 I
thalamic pituitary gonadal axis. CPP is more com-; B( I) n4 B1 m7 I6 h3 z- G9 B6 |
mon in girls than in boys.1,3 Most boys with CPP
: s0 k' `4 t& W9 R6 Smay have a central nervous system lesion that is
& Y6 s0 h& x+ } {3 b ?/ Aresponsible for the early activation of the hypothal-
5 G5 x: q9 Y* Z6 f9 |amic pituitary gonadal axis.1-3 Thus, greater empha-
' `' P( h/ m+ p! K$ ^6 ^sis has been given to neuroradiologic imaging in+ S4 O. j0 T4 V( a3 F! _" e
boys with precocious puberty. In addition to viril-
( `+ E) `9 P# bization, the clinical hallmark of CPP is the symmet-
- h: D- o3 f4 A2 d) P0 [' Jrical testicular growth secondary to stimulation by
' O; Q+ U+ A" {# J, b5 t" L6 Pgonadotropins.1,30 ^) }6 k: B0 f7 j5 ^
Gonadotropin-independent peripheral preco-
$ ~' F9 Z* i5 U- Z' ecious puberty in boys also results from inappropriate
" O7 U' B* F% |- w3 |androgenic stimulation from either endogenous or
1 t( p; V O8 D O" n$ Z5 Hexogenous sources, nonpituitary gonadotropin stim-& K: _* G% f; n3 ^+ g# p) L4 E
ulation, and rare activating mutations.3 Virilizing S/ _; |) a8 n7 U. n/ V7 F
congenital adrenal hyperplasia producing excessive! V W+ c' R3 k6 A
adrenal androgens is a common cause of precocious
1 Q. D. D0 F, P; xpuberty in boys.3,4
% s! V8 J0 A# T- I- aThe most common form of congenital adrenal
6 Z! }: U E- S) ^hyperplasia is the 21-hydroxylase enzyme deficiency.- Z: n- x/ I: E" N6 i
The 11-β hydroxylase deficiency may also result in) p& U6 b& n, R7 `4 I, Q3 c
excessive adrenal androgen production, and rarely,
3 k) v. I# P- u; P' A% U" v) Pan adrenal tumor may also cause adrenal androgen
2 O# }+ K" Q0 | i- N, m4 T) nexcess.1,3
+ ]$ H( b- R: _7 `: g) Tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from& b! e& R8 \( @( F6 \; u
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
8 F6 l! L! Q, B) M3 I( nA unique entity of male-limited gonadotropin-3 C) B) |1 I9 Y0 f Q' e( a
independent precocious puberty, which is also known8 G" m v5 k% { B9 t1 \
as testotoxicosis, may cause precocious puberty at a5 O0 A1 D7 R, _0 N
very young age. The physical findings in these boys* X2 Z* M4 V# f* E3 L
with this disorder are full pubertal development,
# X5 l# r- b9 p/ Fincluding bilateral testicular growth, similar to boys+ k( ^2 t' ?# c4 {$ j' J$ `
with CPP. The gonadotropin levels in this disorder2 ?# L- L- L$ L
are suppressed to prepubertal levels and do not show
$ ^% w, p1 o+ \& R3 Z& Gpubertal response of gonadotropin after gonadotropin-5 d9 I8 \' u4 Q! B: c
releasing hormone stimulation. This is a sex-linked3 P K4 W1 H1 ]5 `: K
autosomal dominant disorder that affects only
V" c; ?5 r8 G5 n3 i: l4 D, Emales; therefore, other male members of the family7 \$ v8 P( @2 {# t% f
may have similar precocious puberty.3
; X# p* m5 {: H7 M! L+ |In our patient, physical examination was incon-
; T l5 x+ ?. M: o4 v5 vsistent with true precocious puberty since his testi-
9 u- q1 b! m$ i/ X9 Acles were prepubertal in size. However, testotoxicosis
# [+ @% O$ X3 o" V9 o5 G' q( awas in the differential diagnosis because his father6 A4 l6 }, _3 m! b) {( O& g5 Q
started puberty somewhat early, and occasionally,
, p4 b; x1 Q0 ~1 \% atesticular enlargement is not that evident in the7 W- p- X' L6 x: A' o3 u1 r' u
beginning of this process.1 In the absence of a neg-
+ |+ K1 G4 S3 x8 f9 I# `/ v. \ative initial history of androgen exposure, our- h. Q, ~& X' L/ g6 p6 }& k
biggest concern was virilizing adrenal hyperplasia,
0 H( S ]. n. M5 r* A$ Seither 21-hydroxylase deficiency or 11-β hydroxylase& l' y2 b1 G3 Y5 K1 n' a* ?) S
deficiency. Those diagnoses were excluded by find-( n9 I) d# L" \( e8 _3 X. T
ing the normal level of adrenal steroids.3 Y7 U) I# Y5 q: m
The diagnosis of exogenous androgens was strongly
* z/ I. p$ U* B4 s0 Y I' N" O! esuspected in a follow-up visit after 4 months because
: T- N% M* L" I, I8 zthe physical examination revealed the complete disap-
* Z2 ]& E5 r/ dpearance of pubic hair, normal growth velocity, and B0 A" k$ M5 V i; P, x; ?" ^0 p+ ]
decreased erections. The father admitted using a testos-7 }5 z5 k5 r. z9 M: H- q
terone gel, which he concealed at first visit. He was
6 b& E2 D( g4 e/ Fusing it rather frequently, twice a day. The Physicians’9 V( I, a2 g( a' e# u
Desk Reference, or package insert of this product, gel or
+ {& y$ n6 s1 \cream, cautions about dermal testosterone transfer to1 G n" F! b1 }; s; _
unprotected females through direct skin exposure.! a' H% a" b- u' @8 X) R
Serum testosterone level was found to be 2 times the" N1 v K: J+ Y( ?. K
baseline value in those females who were exposed to" q, X# |* v/ W5 j e8 r
even 15 minutes of direct skin contact with their male- e3 _- h! d. [8 r; H R
partners.6 However, when a shirt covered the applica-
7 C- V) ~2 Q" Ition site, this testosterone transfer was prevented.
3 A8 s- s I. N/ ]1 gOur patient’s testosterone level was 60 ng/mL,
1 l2 j( o8 a1 Z- s2 O6 twhich was clearly high. Some studies suggest that" y7 N/ q9 H' \1 A3 U
dermal conversion of testosterone to dihydrotestos-+ W0 l8 |5 x5 C2 m( M
terone, which is a more potent metabolite, is more
7 q9 R p" E9 D# T. ~& V8 _4 ~1 q9 _: tactive in young children exposed to testosterone
' ]% G2 B0 x! r, o' d0 ~! ?exogenously7; however, we did not measure a dihy-
% }( K' A& }7 g$ x0 mdrotestosterone level in our patient. In addition to( x) Z0 \/ [. ^) i5 l* Z
virilization, exposure to exogenous testosterone in
2 h' J5 a( l% U: ?/ ?children results in an increase in growth velocity and* D* a; d2 E0 B# n
advanced bone age, as seen in our patient.
1 P4 s8 b! p3 F3 T& dThe long-term effect of androgen exposure during
' ]! t3 V; u1 V- vearly childhood on pubertal development and final
! N$ P: p' D4 b# m' ?1 z& N Oadult height are not fully known and always remain
3 x) k7 R7 Z% G2 f7 {a concern. Children treated with short-term testos- @, N5 U, J `% m" b8 m( N
terone injection or topical androgen may exhibit some
. O7 Y( e5 J, z' E1 U- aacceleration of the skeletal maturation; however, after
% M, v1 s, R% pcessation of treatment, the rate of bone maturation
' ?+ Q; { p8 T" j/ Ndecelerates and gradually returns to normal.8,96 ]" t1 w0 s3 W* G" z: U) q- d
There are conflicting reports and controversy
, y* w3 ^- h$ k$ v$ mover the effect of early androgen exposure on adult
- s K* o2 u; Ipenile length.10,11 Some reports suggest subnormal% f$ s @$ Z$ h+ a' W
adult penile length, apparently because of downreg-
% a$ F$ G) u: J1 W# r# qulation of androgen receptor number.10,12 However,6 w: ^6 m3 v" X5 T p6 J' X ^
Sutherland et al13 did not find a correlation between
* i7 l) f; s6 k7 v$ V2 gchildhood testosterone exposure and reduced adult
" u! a+ h, G( M: h) v9 _penile length in clinical studies.1 }6 V8 }0 Y2 o
Nonetheless, we do not believe our patient is* F2 k4 b1 g. w: G# _- Q
going to experience any of the untoward effects from. ^* `5 H* \. p
testosterone exposure as mentioned earlier because- _+ \* X2 b9 M6 n( B/ w" `
the exposure was not for a prolonged period of time.: s, f: w! _, N) C# ]# v) w
Although the bone age was advanced at the time of. r# J) v2 o* a$ w( ~7 H
diagnosis, the child had a normal growth velocity at
. Y6 c9 ]1 L. ]3 U0 a4 nthe follow-up visit. It is hoped that his final adult, t c, k& W) Y$ {" V
height will not be affected.- G. F. K9 x8 ?8 M$ o
Although rarely reported, the widespread avail-9 g3 H/ A. [7 e- V
ability of androgen products in our society may8 Z# _1 ?- X7 O
indeed cause more virilization in male or female* c% F$ z+ S7 p" `) @& v
children than one would realize. Exposure to andro-% @1 O* T5 [3 M$ @6 P
gen products must be considered and specific ques-
4 B+ w1 q' x# ^. j$ @9 ^9 _8 ttioning about the use of a testosterone product or( g; @: c' h6 c2 X- |! t" E" V- F! H
gel should be asked of the family members during. v f/ ?7 c3 z: q% [4 B3 F
the evaluation of any children who present with vir-/ J3 z: p6 y( @) c1 u
ilization or peripheral precocious puberty. The diag-
- j6 L& B2 j$ k# F7 Mnosis can be established by just a few tests and by
( O$ V8 T+ I( f/ _3 Xappropriate history. The inability to obtain such a7 b: y) S( h8 H( x9 L7 B
history, or failure to ask the specific questions, may# h) I, V% Z) {- Y4 j T
result in extensive, unnecessary, and expensive
' k5 o2 z6 H4 o3 V: B: u( r, R; ainvestigation. The primary care physician should be
; k+ v6 h$ P: @) O: S, f1 _aware of this fact, because most of these children
2 w! V! P" Q# [' V) @# N% H% u6 }' gmay initially present in their practice. The Physicians’( F3 [" C# q$ c3 l
Desk Reference and package insert should also put a
$ y' T9 m( d6 C# p/ B! W, p+ e4 B6 Wwarning about the virilizing effect on a male or
+ v" v9 A- ]7 l4 S: Ifemale child who might come in contact with some-& H! _$ c! ]/ C7 j$ g+ N/ g/ d) Y
one using any of these products.! E' z/ C0 d! S0 Y
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$ o- e* O+ g7 _ h" b) _Economics Company, Inc; 2004:3239-3241.0 q/ U/ `$ ?$ O
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testosterone and gonadotropin. J Urol. 1978;119:
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8. Guthrie RD, Smith DW, Graham CB. Testosterone6 M7 @- U3 d# N M; q3 X
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